My external committee member was a professor in the Department of Earth and Environmental Sciences, and the first time I went to visit him I was delighted with the departmental decor. Geologists know how to outfit a hallway – they had everything from brilliantly colored geological maps of the UK:

Of course I was immediately interested in it because the process on top of it reminded me of the dens, or odontoid processof a human axis. I was excited, and shared the photos with Dr. Zachary Cofran of Lawnchair Anthropology. “You can see it, right?” I asked. “For an osteology everywhere?” “Oh yeah,” he immediately exclaimed, “It’s a hamate!”

It appears this one is something of a Rohrcshach test for osteologists. Or, better yet, one of those tricky illusions that shows two different images at once:

I must admit, I have a history of seeing C2s everywhere I look, so I don’t know that I can necessarily be trusted on this one. Cast your own vote below: